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                pku3985 Knight                </h1>
                <p>时间限制：10s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：128MB</p>			</div>
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                                <h3>题目描述</h3><p><div class="ptx" lang="en-US"><span style="font-size: medium">You must have heard of the Knight's Tour problem. In that problem, a knight is placed on an empty chess board and you are to determine whether it can visit each square on the board exactly once. <br />
<br />
Let's consider a variation of the knight's tour problem. In this problem, a knight is place on an infinite plane and it's restricted to make certain moves. For example, it may be placed at (0, 0) and can make two kinds of moves: Denote its current place as (x,y), it can only move to (x+1,y+2) or (x+2,y+1). The goal of this problem is to make the knight reach a destination position as quickly as possible (i.e. make as less moves as possible).</span></div></p><hr/><h3>输入格式</h3><p><div class="ptx" lang="en-US"><span style="font-size: medium">The first line contains an integer T ( T &lt; 20) indicating the number of test cases. <br />
Each test case begins with a line containing four integer: fx fy tx ty(-5000&lt;=fx,fy,tx,ty&lt;=5000). The knight is originally placed at (fx, fy) and (tx, ty) is its destination. <br />
<br />
The following line contains an integer m(0 &lt; m &lt;= 10), indicating how many kinds of moves the knight can make. <br />
<br />
Each of the following m lines contains two integer mx my(-10&lt;=mx,my&lt;=10; |mx|+|my|&gt;0), which means that if a knight stands at (x,y), it can move to (x+mx,y+my).</span></div></p><hr/><h3>输出格式</h3><p><div class="ptx" lang="en-US"><span style="font-size: medium">Output one line for each test case. It contains an integer indicating the least number of moves needed for the knight to reach its destination. Output &quot;IMPOSSIBLE&quot; if the knight may never gets to its target position.</span></div></p><hr/><h3>样例输入</h3><pre>2
0 0 6 6
5
1 2
2 1
2 2
1 3
3 1
0 0 5 5
2
1 2
2 1


</pre><hr/><h3>样例输出</h3><pre>3
IMPOSSIBLE
</pre><hr/><h3>提示</h3><p>没有写明提示</p><hr/><h3>题目来源</h3><p>没有写明来源</p>
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